| 摘要 |
The invention provides a polypropylene series multi-microporous film of a separating film suitable to be used for a battery. The polypropylene series multi-microporous film contains 100 wt% of mixed resin of homo-polypropylene and co-polypropylene whose melting points are above 160 DEG, and 35-70 wt% of filler. Melt index of the homo-polypropylene is 1-2 gr/min, and weight-average molecular weight is 1*10<5> to 1*10<6>. Relative to the mixed resin, content of the homo-polypropylene is more than 70 wt% and lower than 100 wt%. The co-polypropylene is an ethylene-propylene polymer in which ethylene content is 1-15 wt%, and melt index of the co-polypropylene is 2-5 gr/min, and weight-average molecular weight is 1*10<5> to 1*10<6>. Relative to the above mixed resin, the content of the co-polypropylene is more than 1 wt% and is lower than 30 wt%. |
